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Good VS Bad – Beyond the JavaScript Console

Suchitkumar Khunt
Freelance Adept Coder with having Elegant Design Skill - I've 6 years of hands-on experience in a web application, android apps and elegant design mock-ups.
・3 min read

In your development career, you mostly know about the console.log() but the console API can do many things that you may don’t know. HERE, in this article, we are going to learn all about console API with Good VS Bad practice.

Let’s start with consoling the console object.

Write console.log(console) in your browser’s console editor and you found the list of APIs provided by the console object. Each API purpose is unique and useful in certain cases.

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Below are my explanations of the most useful APIs in console object.

Assume you have an Object on the list and you show that on the JavaScript console.

The Bad Practice

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The Good Practice

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Assertion – Sometimes we want to log only when the condition is false.

console.assert() – If condition false then only give an error. It eliminating the need for if condition and keep your code clean.

The Bad Practice

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The Good Practice

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{ } – Always use Braces to log the object with the name.

The Bad Practice

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The Good Practice

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Group: If you have multiple logs, then try log group for collapsible sections.

The Bad Practice

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The Good Practice

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Always, console object with its’ properties.

The Bad Practice

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The Good Practice

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How to set a timer with the console?

We can start a timer with the console by calling time, then call timeLog to measure the elapsed time. It provides a simple solution for measuring performance.

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Now, lets talk about remaining APIs in console log.

console.clear()

The console.clear() method clears the console

console.count()

Writes to the console the number of times that particular console.count() is called.

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console.info()

This method writes a message to the console.

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console.warn()

The console.warn() method writes a warning to the console.

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console.error()

The console.error() method writes an error message to the console.

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Console.trace()

The console.trace() method displays a trace that shows how the code ended up at a certain point.

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How to apply CSS in console.log()?

We can also apply the style in the console.log(). Use the special %c character to add some style.

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Thank you for reading this article.

Discussion (2)

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ankitkanojia profile image
Ankit Kanojia

such a good post. explained very well with proper formater and exmple.

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khuntsr profile image
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